Drill-spindle-driving mechanism.



PATENTED NOV. 28, 1905. R. G. HENRY & D. M. WRIGHT. DRILL SPINDLB DRIVING MECHANISM.

APPLICATION FILED MAILS, 1905.

J. W 0 Q WMM UNITED STATES PATENT OFFICE.

ROBERT G. HENRY AND DANIEL M. WRIGHT, OF HARTFORD, GON- NECTIOUT.

DRILL-SPINDLE-DRIVING MECHANISM.

Specification of Letters Patent.

Patented Nov. 28, 1905.

- Application filed March 6, 1905. Serial No. 248,539.

To all whom it may concern.-

Be it known that we, ROBERT G. HENRY and DANIEL M. WRIGHT, citizens of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented a new and useful Drill-Spindle-Driving Mechanism, of which the following is a specification.

This invention relates to the mechanism which is provided for rotating the spindle of a drill press.

The invention is particularly designed for a drill-press of the sensitive multiple-spindle type, although it is applicable to a press having a single spindle. These presses are con- .structed with a two-step driving-pulley on a horizontal axis and a two-step spindle-pulley on a vertical axis, and four different speeds are obtained for the spindle with a single cemented belt by changing the belt so as to connect the pulleys necessary to evolve the desired speed. In such aconstruction the driving-pulley is on a horizontal shaft located back of and low down on the column, and the two steps turn in different vertical planes with their peripheries at different distances from the axis of the shaft. The spindle-pulley is on a vertical spindle in front of and high up on the column, and its two steps turn in different horizontal planes with their peripheries at different distances from the axis of the spindle. To produce the desired speeds, the belt must be capable of running on either step of the driving-pulley and on either step of the spindle-pulley, and in order to drive efiiciently the belt must be capable of tracking accurately on the various steps of the pulleys. To accomplish this, a delivery-idler is arranged so that it will properly receive the belt from either step of the driving-pulley and deliver it correctly to either step of the spindle-pulley, and a receiving-idler is arranged so as to properly receive the belt from either step of the spindle-pulley and deliver it correctly to either step of the driving-pulley.

The object of this invention is to so construct and arrange the column and supports wardly-extending arm supporting a rotary vertically-movable spindle that is provided Withthe two-step spindle-pulley and has a rearwardly-extending arbor carrying two adjustable brackets which adjustably hold two idler-pulleys. Lower down back of the column is a horizontal shaft bearing the two-step driving-pulley.

While the invention is designed for and is particularly adapted on account of its simplicity to a multiple-spindle drill-press, it is illustrated and described herein as applied to a single-spindle press, the construction being merely duplicated for the multiple spindles.

Figure 1 of the accompanying drawings shows a side elevation of the upper portion of adrill-press provided with this improved spindle-driving mechanism. Fig. 2 shows a rear elevation of the same. .Fig. 3 shows a plan. Fig. 4 is a diagram showing the belt arranged to drive the spindle at the lowest speed. Fig. 5 is a diagram showing the belt arranged to drive the spindle at the second speed. Fig. 6 is a diagram showing the belt arranged to drive the spindle at the third speed. Fig. 7 is a diagram showing the belt arranged to drive the spindle at the highest speed, and Fig. 8 is a view of the receiving-idler bracket.

The column 1 is built as usual, and the forwardly-extending arm 2 near the upper end of the columns supports the spindle 3 in the usual manner. The spindle-pulley 4:, which rotates in a horizontal plane and has two steps, is supported by the arm and connected with the spindle in any desired manner. The driving-pulley 5, which has two steps, is mounted so as to rotate in avertical plane on a shaft 6, that is supported by brackets 7 at the'bottom of the column. At the top of the column is a head 8 with a horizontal perforation into which is thrust a rearwardly-extending arbor 9. Movable on the arbor is a bracket 10. This bracket is held in position bya set-screw 11. Swiveled to the under side of this bracket is a fork 12, between the arms of which is supported the delivery-idler 13. The outer ends of the fork extend upwardly, so as to guide the belt as it runs over this pulley. Movable on the arboris an offset bracket 14. This bracket is held in position by a setscrew 15. A vertical perforation is made through the offset side of this bracket, and extending through this perforation is the shank 16 of the swiveled fork 17 between the TOE arms of which is the receiving-idler 18. The shank of the fork which supports this idler is held in position by the set-screw 19.

When the set-screw 15 is loosened, the bracket 14 may be rotated on and moved in and out along the arbor. hen the set-screw 19 is loosened, the fork may be raised and lowered. By these means the periphery of the receivingidler can be adjusted to the proper vertical and horizontal planes to correctly receive the belt from either step of the spindle-pulley and send it to either step of the driving-pulley. When the receiving-idler is in the correct position, the set-screws are tightened. Then the delivery-idler bracket is drawn out on the arbor, so the delivery-idler will tighten the belt.

The receiving-idler may have to receive the belt from the extended periphery of the lower and larger step of the spindle-pulley, as shown in Figs. 4 and 5, or it may have to receive the belt from the restricted periphery of the upper smaller step of the spindle-pulley, as shown in Figs. 6 and 7. As the larger step is lower than the smaller step, the receivingidlcr must be lowered when the belt comes from the larger step, as shown in Figs. 4: and 5, and raised when the belt comes from the smaller step, as shown in Figs. 6 and 7, and of course when the belt comes from the larger step the receiving-idler will swing farther out than when it comes from the smaller step. This receiving-idler must also guide the belt onto either the larger step, as shown in Figs. 5 and 7, or smaller step, as shown in Figs. 4 and 6, of the driving-pulley when running on either the larger or the smaller step of the spindle-pulley. To make the belt accurately track the several pulleys, the receivingidler is turned and raised and lowered to the position necessary. When the belt is running on the large steps, the delivery-idler is adjusted close to the receiving-idler, as shown in Fig. 5, and when the belt is running on the smaller steps the delivery-idler is adjusted away from the receiving-idler, as shown in Fig. 6.

By means of the simple and convenient mechanism described the delivery and receiving idlers can quickly be adjusted sidewise, up and down, and along the arbor, and so set that with the single belt either of four speeds may be obtained for the drill-spindle and the belt run tightly and track properly on the pulleys without wasting power.

The invention claimed is 1. A drill-press column, a vertical spindle supported by the column, a step-pulley on said spindle, a horizontal shaft supported by said column, a step-pulley on said shaft, a single support extending rearwardly from the column, two brackets ad j ustably fixed on the support, a forwardly-extending fork swiveled to each bracket, an idler-pulley carried by each fork, and an endless belt extending around the step-pulleys'and over the idler-pulleys, substantially as specified.

2. A drill-press column, a vertical spindle supported by the column, a step-pulley on said spindle, a horizontal shaft supported by said column, a step-pulley on said shaft, a single support extending rearwardly from the column, two brackets adjustably fixed on the support, a swiveled fork depending from one bracket beneath the support, a swiveled fork depending from the other bracket at one side of the support, an idler-pulley carried by each fork, and an endless belt extending around the step-pulleys and over the idler-pulleys, substantially as specified.

3. A drill-press column, a vertical spindle supported by the column, a step-pulley on said spindle, a horizontal shaft supported by said column, a step-pulley on said shaft, a single support extending rearwardly from the column, two brackets adjustable in and out along and adapted to be oscillated on the support, an offset fork swiveled to each bracket, an idler-pulley carried by each fork, and an enclless belt extending around the step-pulleys and over the idler-pulleys, substantially as specified.

4. A drill-press column, a vertical spindle supported by the column, a step-pulley on said spindle, a horizontal shaft supported by said column, a step-pulley on said shaft, a single support extending rearwardly from the column, two brackets adjustably fixed on the support, a fork swiveled to one of said brackets, an idler-pulley carried by the swiveled fork, a vertically-adjustable fork carried by the other bracket, an idler-pulley carried by the adjustable fork, and an endless belt extending around the step-pulleys and over the idlerpulleys, substantially as specified.

5. A drill-press column, a vertical spindle supported by the column, a step-pulley on said spindle, a horizontal shaft supported by the column, a step-pulley on said shaft, a single support extending rearwardly from the column, a bracket adjustably fixed on the support and extending downwardly beneath the support, an idler-pulleyswiveled to this downward bracket and rotating beneath and in a plane longitudinal with the support, a bracket adjustably fixed on the support and extending outwardly from one side of the support, an idler-pulley swiveled to this sidewise bracket and rotating below at one side of the support in a plane longitudinal therewith, and an endless belt extending around the step-pulleys and over the idler-pulleys, substantially as specified.

ROBERT G. HENRY. DANIEL M. WVRIGHT.

Witnesses:

HARRY R. WVILLIAMs, ETHEL M. LOWE. 

